Could some Cisco Employee (maybe @ zowu ?) add new permitted users to my Devnet Sandbox lab and make the reservation time longer (for example for a month)? I cannot add new Permitted users to my sandbox for UCCX as discussed here:
From reading the discussion you need a Cisco admin to do this, if it's now even possible at all. I would request in the DevNet Sandbox community via a discussion or open a ticket by clicking on the green box: